首页|Semicrystalline Unfused Polymer Donors with Backbone Halogenation toward Cost-Effective Organic Solar Cells

Semicrystalline Unfused Polymer Donors with Backbone Halogenation toward Cost-Effective Organic Solar Cells

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Developing novel unfused building blocks with simple synthesis and low cost is essential to advance and enrich cost-effective poly-mer donors;however,it remains a challenge due to the lack of efficient molecular strategies.Herein,a class of low-cost and fully unfused polymer donors with precisely regulated backbone planarity via halogenation was designed and synthesized,namely PDTBTBz-2H,PDTBTBz-2F,and PDTBTBz-2Cl.These polymer donors possess a four-step synthesis route with over 80％yield from cheap raw chemicals comparable to existing low-cost polymer donors,such as PTQ10.Benefitting from the planar backbone via in-corporating the F…S non-covalent interactions,PDTBTBz-2F exhibits more robust J-type aggregation in solution and a long-ranged molecular stacking in film relative to PDTBTBz-2H and PDTBTBz-2Cl.Moreover,the systematical study of PDTBTBz-based organic so-lar cells(OSCs)reveals the close relationship between optimized molecular self-assembly and charge separation/transport regarding backbone halogenation when paired with the non-fullerene acceptor(Y6-BO-4F).As a result,the photovoltaic devices based on semicrystalline PDTBTBz-2F achieved a promising power conversion efficiency(PCE)of 12.37％.Our work highlighted the influence of backbone halogenation on the molecular self-assembly properties and a potential unfused backbone motif for further developing cost-effective OSCs.

Low-costPolymer donorsBackbone halogenationMolecular self-assemblyOrganic solar cells

Yuxin Kong、Shijie Ju、Hongmei Qin、Min Hun Jee、Simeng Xia、Jiaqi Ren、Chao Gao、Jianyu Yuan、Wenyan Su、Han Young Woo、Yuxiang Li

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School of Materials Science and Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices,Institute of Functional Nano & Soft Materials(FUNSOM),Soochow University,199 Ren'ai Road,Suzhou,Jiangsu 215123,China

Department of Chemistry,Korea University,Seoul 02841,Republic of Korea

Xi'an Key Laboratory of Liquid Crystal and Organic Photovoltaic Materials,State Key Laboratory of Fluorine & Nitrogen Chemicals,Xi'an Modern Chemistry Research Institute,Xi'an,Shaanxi 710065,China

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国家自然科学基金国家自然科学基金国家自然科学基金Science and Technology Program of Shaanxi ProvinceScience and Technology Program of Shaanxi ProvinceJiangsu Key Laboratory for Carbon-Based Functional Materials & Devices,Soochow UniversityNational Research Foundation of KoreaNational Research Foundation of Korea

5220324121905225220051212022JM-2292023-JC-QN-0448KJS22082019R1A6A1A110440702020M3H4A3081814

2024

10.1002/cjoc.202300547

中国化学(英文版)
中国化学会 上海有机化学研究所

中国化学(英文版)

CSTPCD
影响因子：0.848
ISSN：1001-604X
年,卷(期)：2024.42(7)
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